CN111910621A - Structure for cooling frozen soil by combining cast-in-place bored concrete pile in perennial frozen soil area with heat pipe - Google Patents
Structure for cooling frozen soil by combining cast-in-place bored concrete pile in perennial frozen soil area with heat pipe Download PDFInfo
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- CN111910621A CN111910621A CN201910390410.4A CN201910390410A CN111910621A CN 111910621 A CN111910621 A CN 111910621A CN 201910390410 A CN201910390410 A CN 201910390410A CN 111910621 A CN111910621 A CN 111910621A
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- frozen soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a structure for cooling frozen soil by combining cast-in-place bored concrete piles in a perennial frozen soil area with heat pipes. The lower evaporation section of the heat pipe is buried in the cast-in-place pile, and the upper condensation section is arranged between the ground surface and the building; the upper part of the heat pipe is provided with a radiator. The invention has simple structure and easy implementation, and can obviously reduce the temperature of the permafrost layer where the pile foundation and the pile foundation are positioned by means of the working characteristics of the heat pipe, thereby preventing the pile foundation from settling.
Description
Technical Field
The invention relates to the field of engineering of perennial frozen soil areas, in particular to a structure for cooling frozen soil by combining cast-in-place bored concrete piles in the perennial frozen soil areas with heat pipes.
Background
In permafrost regions, cast-in-place piles are the most common building foundation scheme in the permafrost regions, but pile foundation settlement often happens due to the fact that frozen soil is heated or melted, the volume of ice in the frozen soil is reduced after the ice in the frozen soil is melted, the frozen soil sinks, and the original bearing capacity is lost after the frozen soil is melted, so that the pile foundation settles, and finally, a building foundation or other engineering foundations are formed to be unevenly deformed, and further, the construction foundation and the like are damaged and cannot be used.
Disclosure of Invention
The invention aims to solve the technical problem of providing a structure for cooling frozen soil by combining cast-in-place bored concrete piles in a permafrost region with heat pipes, which solves the problem of pile foundation settlement caused by the melting of the frozen soil frequently occurring in the permafrost region.
In order to solve the problems, the invention relates to a structure for cooling frozen soil by combining cast-in-place bored concrete piles in a permafrost region with heat pipes, which is characterized in that: the structure comprises a cast-in-situ cast-in-place pile and a heat pipe, wherein the cast-in-situ cast-in-place pile is arranged in a permafrost layer, and the heat pipe is internally provided with a working medium; the lower evaporation section of the heat pipe is buried in the cast-in-place pile, and the upper condensation section is arranged between the ground surface and the building; the upper part of the heat pipe is provided with a radiator.
Compared with the prior art, the invention has the following advantages:
1. the lower evaporation section of the heat pipe is buried in the cast-in-place bored concrete pile, the upper condensation section is arranged between the ground surface and the building, the upper part of the heat pipe is provided with a radiator, when the heat pipe works, the working medium releases heat to the outside cold air at the condensation section and then is cooled and liquefied, the liquefied low-temperature working medium flows downwards to the evaporation section to absorb the heat of the pile foundation and the surrounding frozen soil layer, and then is heated, gasified and evaporated to the condensation section of the heat pipe. This process takes place repeatedly in the heat pipe until the evaporation section temperature approaches or exceeds the condensation section temperature. The temperature of the pile foundation and the permafrost layer where the pile foundation is located can be obviously reduced by means of the working characteristics of the heat pipe, so that the pile foundation is prevented from settling.
2. The invention has simple structure and easy implementation.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of the operation of the heat pipe of the present invention.
In the figure: 1-permafrost layer; 2-cast-in-place bored concrete pile; 3, the earth surface; 4-a building; 5, a heat pipe; 6, a radiator; 7-working medium.
Detailed Description
As shown in figures 1-2, the structure for cooling frozen soil by combining cast-in-place bored concrete piles in a perennial frozen soil area with heat pipes comprises a cast-in-place bored concrete pile 2 arranged in a perennial frozen soil layer 1 and a heat pipe 5 internally provided with a working medium 7. The lower evaporation section of the heat pipe 5 is buried in the cast-in-place bored concrete pile 2, and the upper condensation section is arranged between the ground surface 3 and the building 4; the upper part of the heat pipe 5 is provided with a radiator 6.
The heat pipe is a device for realizing one-way heat conduction by utilizing the principle that working media absorbs heat through evaporation and releases heat through liquefaction, and is widely applied to roadbeds in permafrost regions. In the pile foundation construction stage, after the drilling is finished, one or more heat pipes 5 are tied to a reinforcement cage and placed in the drilling hole for concrete pouring, so that the construction of the cast-in-place pile 2 is finished, the lower evaporation section of each heat pipe 5 is buried in the cast-in-place pile 2, the upper condensation section of each heat pipe 5 is located between the ground surface 3 and a building 4, the upper parts of the heat pipes 5 are provided with radiators 6, and working media 7 are poured into the heat pipes 5. The upper condensation section is exposed in the air, the radiator 6 is added to the condensation section exposed in the air, the heat dissipation efficiency is improved, and the number and the length of the heat pipes 5 are determined according to calculation.
When the heat pipe 5 works, the working medium 7 in the heat pipe 5 absorbs heat at the evaporation section of the heat pipe 5 and evaporates into a gas state to the condensation section of the heat pipe 5, and the heat emitted at the upper part of the heat pipe 5 through the radiator 6 is recovered into a liquid state and flows to the evaporation section through the inner wall of the heat pipe 5. Through the circulation process, heat is continuously and upwards conveyed to form unidirectional heat conduction from bottom to top, and partial heat in the cast-in-place bored concrete pile 2 and the peripheral permafrost layer 1 is brought to the air above the ground surface 3, so that the permafrost layer 1 achieves the cooling effect. The frozen soil layer 1 can not be melted after being kept in a low-temperature state for many years, so that the building 4 or other engineering foundations can not be unevenly deformed to cause damage to the building 4 and the like.
In the embodiment, a permafrost region of a research station (positioned in the abdominal land of the Qinghai-Tibet plateau, 34 degrees of north latitude, 51.2 degrees of east longitude, 92 degrees of east longitude, 56.4 degrees and 4628 meters of altitude) for frozen soil engineering and environment comprehensive observation of the north foot river of the Qinghai-Tibet plateau of the academy of sciences of China is provided, and part of pile foundations in the building process of a house in 2017 adopt the invention: the pile diameter of the pile foundation is 0.8m, the pile length is 10m, the evaporation section of the heat pipe is 8m, the condensation section is 2.2m, the length of the part with fins is 1.4m, the width of the fins is 19mm, and the spacing between the fins is 10 mm. Compared with the temperature of a natural site, the maximum temperature difference of the side temperature of the hot-containing pipe pile at the depth of 4m in the first cold season after the building is built can reach 2.61 ℃, namely: the temperature of the side of the heat-containing pipe pile at the depth of 4m is 2.61 ℃ lower than that of a natural field, so that the heat-containing pipe pile foundation has a remarkable cooling effect.
Claims (1)
1. The utility model provides a structure that cast-in-place bored concrete pile in perennial frozen soil area combines heat pipe to cool down for frozen soil which characterized in that: the structure comprises a cast-in-situ cast-in-place pile (2) arranged in a perennial frozen soil layer (1) and a heat pipe (5) internally provided with a working medium (7); the lower evaporation section of the heat pipe (5) is buried in the cast-in-place pile (2), and the upper condensation section is arranged between the ground surface (3) and the building (4); and a radiator (6) is arranged at the upper part of the heat pipe (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910390410.4A CN111910621A (en) | 2019-05-10 | 2019-05-10 | Structure for cooling frozen soil by combining cast-in-place bored concrete pile in perennial frozen soil area with heat pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910390410.4A CN111910621A (en) | 2019-05-10 | 2019-05-10 | Structure for cooling frozen soil by combining cast-in-place bored concrete pile in perennial frozen soil area with heat pipe |
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| Publication Number | Publication Date |
|---|---|
| CN111910621A true CN111910621A (en) | 2020-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910390410.4A Pending CN111910621A (en) | 2019-05-10 | 2019-05-10 | Structure for cooling frozen soil by combining cast-in-place bored concrete pile in perennial frozen soil area with heat pipe |
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| CN (1) | CN111910621A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113957884A (en) * | 2021-10-28 | 2022-01-21 | 机械工业第六设计研究院有限公司 | Design and construction method of cast-in-situ bored pile-hot rod combined foundation |
| CN115030131A (en) * | 2022-05-31 | 2022-09-09 | 同济大学 | Artificial stratum freezing device and method based on heat pipe |
| CN115059061A (en) * | 2022-07-04 | 2022-09-16 | 中交第一公路勘察设计研究院有限公司 | Frozen soil area partition temperature control pile foundation, pile group system, design method and construction method |
-
2019
- 2019-05-10 CN CN201910390410.4A patent/CN111910621A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113957884A (en) * | 2021-10-28 | 2022-01-21 | 机械工业第六设计研究院有限公司 | Design and construction method of cast-in-situ bored pile-hot rod combined foundation |
| CN115030131A (en) * | 2022-05-31 | 2022-09-09 | 同济大学 | Artificial stratum freezing device and method based on heat pipe |
| CN115059061A (en) * | 2022-07-04 | 2022-09-16 | 中交第一公路勘察设计研究院有限公司 | Frozen soil area partition temperature control pile foundation, pile group system, design method and construction method |
| CN115059061B (en) * | 2022-07-04 | 2024-02-23 | 中交第一公路勘察设计研究院有限公司 | Frozen soil area partition control Wen Zhuangji, pile group system, design method and construction method |
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